High voltage SnO2 varistors prepared from nanocrystalline powders

被引：5

作者：

Shahraki, Mohammad Maleki ^{[1
]}

Shojaee, Seyyed Ali ^{[1
]}

Nemati, Ali ^{[1
]}

Sani, Mohammad Ali Faghihi ^{[1
]}

机构：

[1] Sharif Univ Technol, Dept Mat Sci & Engn, Tehran 113659466, Iran

来源：

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS | 2010年 / 21卷 / 02期

关键词：

ZINC-OXIDE VARISTORS; ZNO-BASED VARISTORS; SNO2-BASED VARISTORS; ELECTRICAL-PROPERTIES; NONOHMIC PROPERTIES; CERAMICS; MICROSTRUCTURE; DENSE; SEGREGATION; BEHAVIOR;

D O I：

10.1007/s10854-009-9893-4

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In this study, SnO2-based varistors were prepared from mechanically activated nanocrystalline powders. Nanocrystalline powders were derived by subjecting the initial powders to intensive high-energy activation with different times and ball to powder ratio. The effect of activation parameters on the powder properties and sintering temperature, as well as microstructural, micro-electrical and macro-electrical properties of the final specimens was evaluated. Varistors derived from high-energy mechanical activation exhibit a higher density (98.3% relative density) and more refined microstructure upon sintering at 1,300 A degrees C in comparison varistors prepared from conventional powders. Breakdown voltage and nonlinear coefficient were increased up to 24 kV/cm and 45 respectively.

引用

页码：199 / 205

页数：7

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